When a person looks way more overweight in a photo than in real-life, and not just in a 'the camera adds ten pounds' way. Not even the most flattering of clothing can offset the condition, and subsequently the induvidual avoids being in photos, or stands behind others in a group picture. This condition usually strikes females.

Sara: I saw that picture of you at Dawns' party on her Facebook page. Your rack is HUGE!
Mandy: Ugh, I know. I have big boobs anyway, but in pictures they seem to double in size, along with the rest of me. I have such photobesity.